dcf.cymru stimulus sheet · IT · Year 7

Lowri’s screen time and sleep log

Lowri and every time on this sheet are invented for practice.

1. Why Lowri kept a log

Lowri is in Year 7 in Llandeilo. She feels tired in morning lessons and her phone says her screen time is her phone says her screen time is “up 20% on last week”. She does not know what that means in hours, soldquo;up 2 hours 20 minutes on last weekher phone says her screen time is “up 20% on last week”. She does not know what that means in hours, sordquo;. She wants to see where the time goes, so for one week she wrote down every time she used her phone or tablet for more than a few minutes, the time she turned her light out, and the time she woke up. All times are on the 24-hour clock.

2. The log

Day	Screen session 1	Screen session 2	Light out	Woke up (next morning)	Notes
Monday	16:15 to 17:00	19:40 to 21:30	21:45	07:00	Video calls with Cerys
Tuesday	16:30 to 17:15	20:05 to 22:20	22:30	07:00	Watched a series
Wednesday	16:20 to 16:50	18:45 to 20:15	21:15	07:00	Swimming club 17:00 to 18:30
Thursday	16:10 to 17:25	20:30 to 22:55	23:00	07:05	Group chat about the weekend
Friday	16:00 to 18:10	21:00 to 23:35	23:40	09:30	Online game with friends
Saturday	10:15 to 12:45	19:00 to 23:20	23:30	10:00	Rainy day
Sunday	11:00 to 12:10	20:15 to 21:55	22:05	07:00	Homework on the tablet in session 1

A school night is a night before a school day: Sunday, Monday, Tuesday, Wednesday and Thursday nights.

3. What sleep experts say

Children and teenagers usually need more sleep than adults, and most healthy adults need around 7 to 9 hours a night (NHS Every Mind Matters).
The American Academy of Sleep Medicine, a group of sleep doctors, advises that children aged 6 to 12 should regularly sleep 9 to 12 hours a night, and teenagers aged 13 to 18 should sleep 8 to 10 hours.
Many sleep experts advise putting screens away about an hour before bed. Bright screens and exciting content can make it harder to fall asleep, and notifications can wake you up.

4. Working with time

Counting on is the safest way to find a time difference. Example: 16:45 to 18:20.

16:45 to 17:00 is 15 minutes.
17:00 to 18:00 is 1 hour (60 minutes).
18:00 to 18:20 is 20 minutes.
Total: 15 + 60 + 20 = 95 minutes = 1 hour 35 minutes.

For sleep, count on through midnight. Example: 22:40 to 07:10 is 20 minutes to 23:00, 1 hour to 00:00, 7 hours to 07:00, then 10 minutes: 8 hours 30 minutes.

Remember: 1 hour = 60 minutes, so 130 minutes = 2 hours 10 minutes, not 1 hour 30.